等物质的量的N2、O2、CO2混合气体通过Na2O2后,体积变为原体积的(同温同压),这时混合气体中N2、O2、CO2物质的量之比为 ( ) A. 3∶4∶1 B. 3∶3∶2 C. 6∶7∶3 D. 6∶9∶0 答案:A
I ________ her to work hard at English, but she didn't listen to me.
[ ]
A.persuaded
B.tired to persuade
C.managed to persuade
D.suggested